Orbital Frontal Cortex Projections to Secondary Motor Cortex Mediate Exploitation of Learned Rules

Scientific Reports
Drew C Schreiner, Christina M Gremel

Abstract

Animals face the dilemma between exploiting known opportunities and exploring new ones, a decision-making process supported by cortical circuits. While different types of learning may bias exploration, the circumstances and the degree to which bias occurs is unclear. We used an instrumental lever press task in mice to examine whether learned rules generalize to exploratory situations and the cortical circuits involved. We first trained mice to press one lever for food and subsequently assessed how that learning influenced pressing of a second novel lever. Using outcome devaluation procedures we found that novel lever exploration was not dependent on the food value associated with the trained lever. Further, changes in the temporal uncertainty of when a lever press would produce food did not affect exploration. Instead, accrued experience with the instrumental contingency was strongly predictive of test lever pressing with a positive correlation between experience and trained lever exploitation, but not novel lever exploration. Chemogenetic attenuation of orbital frontal cortex (OFC) projection into secondary motor cortex (M2) biased novel lever exploration, suggesting that experience increases OFC-M2 dependent exploitation of l...Continue Reading

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Citations

Jan 28, 2020·Alcoholism, Clinical and Experimental Research·Tatiana A ShnitkoKathleen A Grant
Jan 20, 2021·Nature Medicine·Shrey GroverRobert M G Reinhart

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